Posterior mandibular residual resorption in patients with implant overdentures retained by bar or ball attachments: 6 years prospective comparative study
El Hadary, Amany Ahmed
Ismaiel, Mohammed Diaa Z.
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Purpose: The aim of this study was to investigate posterior mandibular residual ridge resorption following the use of four endosseous implants either connected to ball attachments or splinted with a bar to retain complete mandibular overdentures over 6 years follow up period. Materials & Methods: Fourteen completely edentulous male patients were divided into two equal groups; Group I (OD): Patients received a mandibular overdenture retained y four implants after attaching ball and socket attachment system. Group II (BOD): Patients received a mandibular overdenture retained by a bar connected to the four implants. Panoramic radiographs were obtained from all patients in both groups after stage two surgeries and 6 years later. Proportional area measurements were used to determine changes in mandibular posterior residual ridge in both groups. Calculations were performed by a computer program to calculate the change in posterior area index (PAI) for each patient from base line to 6 years. Results: there was a statistically significant difference in mandibular posterior residual ridge resorption between the two treatment protocols in favor of Group II. For Group I (OD) the mean change in PAI was 0.088± 0.037, while for Group II (BOD) was 0.043± 0.035. Regression analysis revealed no correlation between PAI and initial mandibular ridge height, while age had a statistically significant effect on PAI. Conclusion: Bar retained mandibular overdentures appear to be associated with reduced posterior mandibular ridge resorption when compared to ball retained ones .
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